(for European Brown Hare, a.k.a. Brown Hare, a.k.a. Lepus europaeus, a.k.a. Brown Hare)The European Hare can run at speeds of up to 0.06 mach. While speed is a factor in their escapes, hares evade their chief predators — wolves, foxes, and golden eagles — by fleeing in a zigzag pattern.

(a.k.a. English greyhound) (approximate maximum speed)Greyhounds reach average race speeds of 0.0607 mach. Despite their racing prowess, greyhounds are not considered energetic dogs — the typical greyhound race requires the dogs to run for less than 35 seconds.

In other words, 0.06 mach is 1.18 times the speed of Secretariat, and the speed of Secretariat is 0.847 times that amount.

(at Belmont Stakes, 1973)Setting a record finish, Secretariat ran the Belmont Stakes — a 12 furlong race length — in 2:24, for an average speed of 0.0506 mach in 1973. His margin of victory in the race, also a record-setter, was 31 lengths.

In other words, the speed of a Knuckleball (baseball) is 1.5 times 0.06 mach.

(a.k.a. knuckler, a.k.a. floater, a.k.a. dancer, a.k.a. butterfly ball) (major league average)The average speed of major league knuckleball pitch is 0.092 mach. Eddie Cicotte, who was later implicated in the 1919 Black Sox scandal, is credited with developing the pitch ca. 1906.